The last Synology box I configured, a RS4021xs+, has currently a "System health" status of "Danger: The system is now in a dangerous status". In Storage manager every drive is listed as "Unverified" and with a red triangle. (Seagate ST18000NM disks, so quite common.)

I configured it about a year ago. Before I updated to what was then a beta version of DSM it refused to install all together, which was quite frustrating.

The list of supported drives according to Synology is depressingly short for this model - the only non-Synology or Toshiba drive is a single Western Digital.

That's just someone saying that - not an actual source. Anyone can claim anything on the internet.